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首页> 外文会议>World Conference on Titanium v.1; 20030713-20030718; Hamburg; DE >Factors Affecting Radiographic Detectability of Ceramic Facecoat Inclusions in Titanium Investment Castings
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Factors Affecting Radiographic Detectability of Ceramic Facecoat Inclusions in Titanium Investment Castings

机译：影响钛熔模铸件中陶瓷面涂层夹杂物射线照相可检测性的因素

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摘要

The F/A-22 Raptor is the first aircraft to utilize titanium castings for safety-critical airframe structure. This required a thorough understanding of casting flaws, the most common of which are ceramic facecoat inclusions. Considerable effort was expended to characterize the radiographic detectability of facecoat inclusions in Ti6Al4V castings with some surprising results. In titanium investment casting, the facecoat is the ceramic mold layer in contact with the molten titanium. If a portion of the facecoat detaches from the mold wall prior to or during casting, it may become entrapped in the molten titanium, forming an inclusion. To maintain required quality standards, such inclusions must be detectable above a critical size. Radiographic Probability of Detection (POD) studies with artificial inclusions were initially performed to establish detectability limits of each facecoat system used. Later work on the program with bona fide shell inclusions did not support these original POD curves. This was attributed to a combination of factors, including variations in facecoat thickness and loss of contrast due to volumetric titanium displacement. This paper discusses factors influencing inclusion detectability, and how POD curve corrections were made using experiment and calculation.
机译：F / A-22 Raptor是首架将钛铸件用于对安全至关重要的机身结构的飞机。这需要彻底了解铸造缺陷，其中最常见的是陶瓷表面涂层夹杂物。花费了大量的精力来表征Ti6Al4V铸件中表面涂层夹杂物的射线照相可检测性，并得出了一些令人惊讶的结果。在钛熔模铸造中，表面涂层是与熔融钛接触的陶瓷模具层。如果在铸造之前或铸造过程中一部分表面涂层从模具壁上脱落，则表面涂层可能会被熔融钛截留，形成夹杂物。为了维持所需的质量标准，必须在临界尺寸以上才能检测到此类夹杂物。最初使用人工夹杂物进行了放射线检测概率（POD）研究，以建立所用每种面漆系统的可检测性极限。后来使用真正的贝壳夹杂物对该程序进行的工作不支持这些原始的POD曲线。这归因于多种因素的组合，包括表面涂层厚度的变化和由于体积钛位移引起的对比度损失。本文讨论了影响夹杂物可检测性的因素，以及如何使用实验和计算对POD曲线进行校正。

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